Model 900 Single Channel- Tunable Active Filter Instruments Certified Description Frequency Devices’ Model 900 instruments furnish the user with a 4 or 8-pole low-pass or high-pass instrument that has a field replaceable filter module and is tunable by front panel controls. The controls allow the user to select a corner frequency between 0.1Hz and 49.9kHz with a resolution of 1:499 for each of the four selectable ranges. The instrument exhibits an input impedance of 1 MΩ shunted by 47pF to a single ended signal source. When configured in the differential mode, the instrument has a common mode rejection ratio (CMRR) which exceeds 60dB; in this mode the instrument presents an input impedance of 2 MΩ shunted by 47pF to a double ended single source. Front panel gain control also enables the operator to select a gain factor of 0, 10, or 20dB. Standard operational features include: 1) Plug-in Filter Module 2) Adjustable Frequency Control 3) Differential Input Amplifiers 4) Adjustable Gain Control 5) Off-set Adjustment 6) Bypass Control 7) BNC Connectors for Signal I/O An optional battery powered version (900B)is available and is particularly well suited to applications requiring isolation from an electrically noisy primary power source. Chassis: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900C Standard AC powered chassis 900B AC powered, with battery powered option Available Low-Pass Models: . . . . . . . . . . . . . Page 9L4B 4-pole, Butterworth . . . . . . . . . . . . . . . . . . 3 9L4L 4-pole, Bessel . . . . . . . . . . . . . . . . . . . . . . 3 9L8B 8-pole Butterworth. . . . . . . . . . . . . . . . . . . 3 9L8L 8-pole, Bessel . . . . . . . . . . . . . . . . . . . . . . 3 9L8E 8-pole, elliptic, 1.77, 80 dB . . . . . . . . . . . . 4 9L8EY 8-pole, elliptic, 2.00, 100 dB . . . . . . . . . . . 4 9L8D80 8-pole, constant delay, 80 dB . . . . . . . . . . 4 9L8D10 8-pole, constant delay, 100 dB . . . . . . . . . 4 Compact size and manual rotary switch front panel controls make 900 instruments a popular, cost effective, easy-to-use solution for signal conditioning applications in the following areas: Anti-aliasing Filters Biomedical/Biotechnology Applications Data Recording/Playback Data Smoothing EKG/EEG Signal Filtering FDM/PCM Signal Filtering Medical Research Industrial Process Control Seismic Analysis Vibration Analysis Available High-Pass Models: . . . . . . . . . . . . . Page 9H4B 4-pole, Butterworth . . . . . . . . . . . . . . . . . . 5 9H8B 8-pole, Butterworth . . . . . . . . . . . . . . . . . . 5 9H8E 8-pole, elliptic, 1.77, 80 dB . . . . . . . . . . . . 5 9H8EY 8-pole, elliptic, 2.00, 100 dB . . . . . . . . . . . 5 General Specifications: Ordering information . . . . . . . . . . . . . . . . . . . . . . . 10 1 25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839 e-mail: [email protected] • Web Address: http://www.freqdev.com Model 900 Tunable Active Filter Instruments BLOCK DIAGRAM GAIN (dB) INPUT 10dB 0dB 20dB A A-B + OUT DIFF AMP A 8-POLE TUNABLE FILTER OUTPUT AMP – BYPASS OFFSET NULLED B CORNER FREQUENCY TUNING OFFSET 1 0 2 TYPICAL FRONT PANEL BNC CONNECTOR TYPICAL ADJUSTMENT FUNCTION CORNER FREQUENCY HZ 5 3 4 6 4 4 3 7 3 2 8 2 1 0 9 5 MULTIPLIER 10 1 100 6 7 0.1 8 1 0 9 FRONT PANEL 2 25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839 e-mail: [email protected] • Web Address: http://www.freqdev.com Model 900 4 & 8-Pole Low-Pass Filters Model 9L4B 9L4L 9L8B 9L8L Transfer Function 4-Pole, Butterworth 4-Pole, Bessel 8-Pole, Butterworth 8-Pole, Bessel Range fc, 0.1 Hz to 49.9 kHz 0.1 Hz to 49.9 kHz 0.1 Hz to 49.9 kHz 0.1 Hz to 49.9 kHz Theoretical Transfer Characteristics Appendix A Page 7 Appendix A Page 2 Appendix A Page 9 Appendix A Page 4 Tuning Resolution 1 part in 499 within each decade 1 part in 499 within each decade 1 part in 499 within each decade 1 part in 499 within each decade Passband Ripple 0.0 dB 0.0 dB 0.0 dB 0.0 dB 0 ± 0.2 dB max. 0 ± 0.1 dB typ. 0 ± 0.2 dB max. 0 ± 0.1 dB typ. 0 ± 0.2 dB max. 0 ± 0.1 dB typ. 0 ± 0.2 dB max. 0 ± 0.1 dB typ. Stopband Attenuation 24 dB/octave 24 dB/octave 48 dB/octave 48 dB/octave Cutoff Frequency Accuracy fc ± 2% max. ± 0.5% typ. Product Specifications (theoretical) DC Voltage Gain (non-inverting) Stability Amplitude Phase Filter Attenuation (theoretical) ± 2% max. ± 0.02% /°C max. ± 0.01% /°C typ. -3dB -180° 0.67 dB 3.01 dB 30.0 dB 40.0 dB fc ± 2% max. ± 0.5% typ. ± 2% max. ± 0.02% /°C max. ± 0.01% /°C typ. -3dB -121° 0.80 fc 1.00 fc 2.37 fc 3.16 fc 1.86 dB 3.01 dB 30.0 dB 40.0 dB fc ± 2% max. ± 0.5% typ. ± 2% max. ± 0.02% /°C max. ± 0.01% /°C typ. - 3 dB -360° 0.80 fc 1.00 fc 3.50 fc 4.72 fc 0.12 dB 3.01 dB 60.0 dB 80.0 dB fc ± 2% max. ± 0.5% typ. ± 2% max. ± 0.02% /°C max. ± 0.01% /°C typ. - 3 dB -182° 0.80 fc 1.00 fc 2.37 fc 3.16 fc 1.91 dB 3.01 dB 60.0 dB 80.0 dB Total Harmonic Distortion @ 1 kHz < - 90 dB typ. < - 90 dB typ. < - 90 dB typ. < - 90 dB typ. Wide Band Noise 200 µVrms typ 200 µVrms typ 200 µVrms typ. 200 µVrms typ. 50 µVrms typ. 50 µVrms typ. 50 µVrms typ. 50 µVrms typ. 0.80 fc 1.00 fc 4.52 fc 6.07 fc (5 Hz - 2 MHz) Narrow Band Noise (5 Hz - 100 kHz) 3 25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839 e-mail: [email protected] • Web Address: http://www.freqdev.com Model 900 8-Pole Low-Pass Filters Model 9L8E 9L8EY 9L8D80 9L8D10 Transfer Function 8-Pole, 6 zero, Elliptic 8-Pole, 6 zero Elliptic 8-Pole, 6 zero Constant Delay 8-Pole, 6 zero, Constant Delay Range fc, fr 0.1 Hz to 49.9 kHz 0.1 Hz to 49.9 kHz 0.1 Hz to 49.9 kHz 0.1 Hz to 49.9 kHz Theoretical Transfer Characteristics Appendix A Page 24 Appendix A Page 25 Appendix A Page 21 Appendix A Page 22 Tuning Resolution 1 part in 499 within each decade 1 part in 499 within each decade 1 part in 499 within each decade 1 part in 499 within each decade Passband Ripple ± 0.035 dB -0.05 dB 0.15 dB 0.15 dB 0 ± 0.2 dB max. 0 ± 0.1 dB typ. 0 ± 0.2 dB max. 0 ± 0.1 dB typ. 0 ± 0.2 dB max. 0 ± 0.1 dB typ. 0 ± 0.2 dB max. 0 ± 0.1 dB typ. Stopband Attenuation -80 dB typ. -100 dB typ. -80 dB typ. -100 dB typ. Cutoff Frequency Accuracy fr ± 2% max. ± 2% max. ± 0.5% typ. ± 0.02% /°C max. ± 0.01% /°C typ. -0.035 dB - 323° fr ± 2% max. ± 2% max. ± 0.5% typ. ± 0.02% /°C max. ± 0.01% /°C typ. -0.05 dB -419° fc ± 2% max. ± 2% max. ± 0.5% typ. ± 0.02% /°C max. ± 0.01% /°C typ. - 3 dB -306° fc ± 2% max. ± 2% max. ± 0.5% typ. ± 0.02% /°C max. ± 0.01% /°C typ. - 3 dB - 311° 0.035 dB 3.01 dB 60.0 dB 80.0 dB 0.05 dB 3.01 dB 80.0 dB 100.0 dB 3.01 dB 60.0 dB 80.0 dB 3.01 dB 80.0 dB 100.0 dB Product Specifications (theoretical) DC Voltage Gain (non-inverting) Stability Amplitude Phase Filter Attenuation (theoretical) 1.00 fr 1.13 fr 1.67 fr 1.77 fr 1.00 fr 1.06 fr 1.83 fr 2.00 fr 1.00 fc 3.08 fc 3.57 fc Total Harmonic Distortion @ 1 kHz < - 90 dB typ. < - 88 dB typ. < - 90 dB typ. < - 88 dB typ. Wide Band Noise 250 µVrms typ. 250 µVrms typ. 200 µVrms typ. 200 µVrms typ. 75 µVrms typ. 75 µVrms typ. 50 µVrms typ. 50 µVrms typ. 1.00 fc 4.45 fc 5.20 fc (5 Hz - 2 MHz) Narrow Band Noise (5 Hz - 100 kHz) 4 25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839 e-mail: [email protected] • Web Address: http://www.freqdev.com Model 900 4 & 8-Pole High-Pass Filters Model 9H4B 9H8B 9H8E 9H8EY Transfer Function 4-Pole Butterworth 8-Pole Butterworth 8-Pole, 6 zero Elliptic 8-Pole, 6 zero Elliptic Range fc, fr 0.1 Hz to 49.9 kHz 0.1 Hz to 49.9 kHz 0.1 Hz to 49.9 kHz 0.1 Hz to 49.9 kHz Theoretical Transfer Characteristics Appendix A Page 27 Appendix A Page 29 Appendix A Page 37 Appendix A Page 38 Tuning Resolution 1 part in 499 within each decade 1 part in 499 within each decade 1 part in 499 within each decade 1 part in 499 within each decade Passband Ripple 0.0 dB 0.0 dB ± 0.035 dB - 0.05 dB 0 ± 0.2 dB to 100 kHz 0 ± 0.5 dB to 120 kHz 0 ± 0.2 dB to 100 kHz 0 ± 0.5 dB to 120 kHz 0 ± 0.2 dB to 100 kHz max. 0 ± 0.5 dB to 120 kHz typ. 0 ± 0.2 dB to 100 kHz max. 0 ± 0.5 dB to 120 kHz typ. Power Bandwidth 120 kHz 120 kHz 120 kHz 120 kHz Stopband Attenuation 24 dB/octave 48 dB/octave -80 dB typ. -100 dB typ. Cutoff Frequency Accuracy fc ± 2% max. ± 0.5% typ. Product Specifications (theoretical) Voltage Gain (non-inverting) Stability Amplitude Phase Filter Attenuation (theoretical) ± 2% max. ± 0.02% /°C max. ± 0.01% /°C typ. - 3 dB -180° 40 dB 30 dB 3.01 dB 0.02 dB fc ± 2% max. ± 0.5% typ. ± 2% max. ± 0.02% /°C max. ± 0.01% /°C typ. - 3 dB -360° 0.31 fc 0.42 fc 1.00 fc 2.00 fc 80 dB 60 dB 3.01 dB 0.00 dB fr ± 2% max. ± 0.5% typ. ± 2% max. ± 0.01% /°C max. ± 0.01% /°C typ. - 0.035 dB -323° 0.31 fc 0.42 fc 1.00 fc 2.00 fc 80 dB 60.0 dB 3.01 dB 0.03 dB 0.00 dB fr ± 2% max. ± 0.5% typ. ± 2% max. ± 0.02% /°C max. ± 0.01% /°C typ. - 0.5 dB -419° 0.56 fr 0.60 fr 0.88 fr 1.00 fr 2.00 fr 100 dB 80.0 dB 3.01 dB 0.03 dB 0.00 dB Total Harmonic Distortion < - 88 dB typ. < - 88 dB typ. < - 88 dB typ. < - 88 dB typ. Wide Band Noise 400 µVrms typ. 400 µVrms typ. 400 µVrms typ. 500 µVrms typ. 100 µVrms typ. 100 µVrms typ. 100 µVrms typ. 150 µVrms typ. 0.50 fr 0.55 fr 0.94 fr 1.00 fr 2.00 fr (5 Hz - 2 MHz) Narrow Band Noise (5 Hz - 100 kHz) 5 25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839 e-mail: [email protected] • Web Address: http://www.freqdev.com Model 900 Location of Front Panel Terminals and Controls Location of Front Panel Terminals and Controls A B C POWER 1 2 0 ON D CORNER FREQUENCY HZ 5 4 4 3 6 4 F E 5 MULTIPLIER 10 100 1 6 3 7 3 7 0.1 2 8 2 8 1 0 OFF – 900 9 1 0 G J ACTIVE FILTER GAIN BYPASS INPUT (DB) 10 IN A-B 0 9 A 20 OUT + OFFSET K H OUT L M A N B O A. POWER ON/OFF Switch: A two position toggle switch that interrupts/completes the internal DC power circuit and resets the battery protection circuit. E. CORNER FREQUENCY Selector Switch (0-9): This ten position rotary switch selects the 1’s digit of the desired corner frequency between 0 and 9, in discrete increments of 1. K. OFFSET Adjust: This adjustment is intended to zero the offset that results from the instruments own circuitry and does not provide for wide range offset to remove dc input signals. B. POWER Status Lamp: This red LED indicates whether or not the power to the analog filter circuitry of a Model 900 instrument is correct. With the POWER switch in the ON position the LED glows continuously if the internal DC power levels are correct, flashes for low DC power levels, and goes off for grossly improper DC power levels. See power lamp status, page 14. F. MULTIPLIER Selector Switch: This four position rotary switch multiplies by a factor of either 0.1, 1, 10, or 100, the aggregate value set on the three CORNER FREQUENCY selector switches. (C, D & E). L. GROUND ( ) Terminal: This “Banana” type test jack provides neat and secure access to the internal ground. This terminal is a convenient junction for grounding external system and measurement instrumentation and/or apparatus. C. CORNER FREQUENCY Selector Switch (0-400): This five position rotary switch selects the 100’s digit value of the corner frequency designator. The switch selectable values are 0, 100, 200, 300, and 400 in five discrete steps. H. BYPASS Switch: OUT and IN setting of this two position toggle switch routes the input signal to the internal low-pass filter or around it, respectively. For either case, the GAIN switch remains operational. D. CORNER FREQUENCY Selector Switch (0-90): This ten position rotary switch selects the 10’s digit of the desired corner frequency between 0 and 90, in discrete increments of 10. J. INPUT Switch: This three position toggle configures the instrument for either differential inputs (A-B), a singleended input (A), or input nulling ( ) which grounds both the (A) and (B) input terminals. G. GAIN Switch: This three position toggle switch selects an overall filter gain of either 0, 10, or 20dB. M. OUT Terminal: This terminal is a female BNC connector. The shield on the BNC is internally connected to the instrument ground. N & O. (A) and (B) Input Terminals: This pair of shielded, female BNC connectors accept signal inputs (A) and (B). The instrument applies a noninverting gain to input (A) and an equal but opposite inverting gain to input (B) while the GAIN switch sets the magnitude of differential gain to either 0, 10, or 20dB. The BNC shields have been internally connected to the instrument ground. 6 25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839 e-mail: [email protected] • Web Address: http://www.freqdev.com Model 900 Controls and Terminals Location of Rear Panel Terminals and Controls FUSE Q 110V 220V NOM VDC 105125 210250 NOM FREQ 5060 HZ 5060 HZ P S 900_8L SERIAL No. 20067 110 R 220 MODEL No. MADE IN U.S.A. 10/31/94 P. IDENTIFICATION LABEL: This label identifies the filter type, serial number and date of manufacture. Q. POWER designation: This label identifies operating power limits and fuse requirements of the instrument. VOLTAGE SELECTOR R. POWER CONNECTION: plug and fuse location. Denotes S. VOLTAGE Selector Switch: This two position switch determines the operating voltage (110 Vac or 220 Vac). At time POWER Lamp Status Steps to Follow: 1. Unplug (disconnect from Power) instrument. LAMP STATUS AC POWER LINE INTERNAL BATTERY ON Operating Normally Operating Normally Line and internal voltages are correct Sufficient battery charge FLASHING Possible Causes: Low AC line voltage Possible Causes: Batteries near exhaustion Fault external causing power overload Internal instrument fault (approximately 30 minutes of operation remain Possible Causes: POWER Switch off Momentary power line drop-out tripped protection circuit.* Open line fuse Possible Causes: POWER Switch off Internal protection circuit tripped.* *Reset by cycling POWER Switch off then on. of shipment, the voltage select switch is preset in the 110 Vac position. For 220 Vac operation, this switch must be rotated to the 220 Vac position. Filter Replacement Instructions: POWER SOURCE OFF 3/16 A 250V SELECT 2. Turn chassis over. 3. With black instrument supports facing up, remove mounting screws. 4. Holding cover in place, turn unit to up-right position and remove top cover. 5. Locate black filter module and carefully remove from channel board. 6. Match replacement filter module pin locations with insertion holes in channel board and gently insert replacement module. 7. Replace instrument top cover, carefully turn over and install instrument supports and screws. 7 25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839 e-mail: [email protected] • Web Address: http://www.freqdev.com Model 900 Operation and Application Guide Lines Initial Setup Select desired operating voltage 110 Vac or 220 Vac. See note "S" page 14. Set the OFFSET control for a zero-volt reading on the scope. Set the POWER ON/OFF Switch to ON. A continuously lit POWER status lamp denotes proper internal dc voltages, an essential indication for battery powered models. Allow the instrument a three minute warm-up period to achieve thermal equilibrium. Subsequent changes of CORNER FREQUENCY, GAIN or BYPASS control settings will introduce a small dc output offset which should be zeroed for critical applications. Leaving all other controls unchanged, set the Input Switch to (A-B) and apply a 5Vdc signal simultaneously to input BNCs (A) and (B). The voltage measured at the OUT BNC should be 5-5=OVdc. This completes preliminary test and adjustment. To perform initial adjustment and/or operational testing, set the remaining front panel controls as follows: a) The three base CORNER FREQUENCY switches and the MULTIPLIER to the desired corner frequency... Corner Frequency Selection b) The OFFSET control to approximately mid-range... To select a corner frequency, simply set the three CORNER FREQUENCY switches and the MULTIPLIER switch for the desired numerical value. c) The GAIN switch to the desired value... d) The BYPASS switch to OUT... The CORNER FREQUENCY switch weighings follow standard decimal positional convention. e) The INPUT switch to ground ( )... Connect a dc-coupled oscilloscope, of vertical sensitivity 10mV/CM or better, or a digital voltmeter (DVM) to the instrument front panel BNC connector labeled OUT. Circuit model illustrating relationship between filter's differential input amplifier and external signal and error sources. DIFFERENTIAL INPUT AMPLIFIER 0d B INPUT SIGNAL AND NOISE VOLTAGE SOURCES RSA 10 dB * 20 A dB * (+) VA GAIN = K RCM+ VCM RCM- SIGNAL COMMON RSB FILTER/ BYPASS DIFF AMP RD VB (–) The accuracy of the corner frequency is improved by selecting the largest possible base frequency and down scaling by the MULTIPLIER. The greatest accuracy is obtained with the largest base 400, and the 0.1X MULTIPLIER switch 400 setting. Relative accuracy of selected 40 Hz actual corner frequency for different multiplier switch settings. BASE FREQ X MULT. RELATIVE msd Isd TUNING C D E F ACCURACY 4 0 0 0 4 0 0 0 4 0.1X 1X 10X GREATEST LESS LEAST The instrument utilizes a differential input amplifier to reject prevalent forms of electrical interference, while presenting desirable input characteristics to the signal source requiring filtering. The differential Input The differential input configuration is ideal for measuring the difference between two values rather than the values themselves. Bridge circuits utilizing strain gages, thermocouples and a variety of other types of transducers generate differential full scale output voltages in the order of millivolts that are often superimposed upon volt-level reference and noise values. The importance of CMRR Vo = K(VA - VB) + Vcm/CMRR : WHERE K = 1, 10 AND 10 FOR GAIN SETTINGS B OF 0, 10 AND 20dB RESPECTIVELY. –Vs VP OUTPUT AMPLIFER - * COUPLED POWER LINE NOISE VOLTAGE * OUT + The C, D and E switches combined can select base corner frequency values ranging from 1 to 499 Hz in 1Hz steps, with switch weighings as just described. (–) COM +Vs (+) SEE TEXT FOR REMAINING TERMS. * DENOTES FRONT PANEL ACCESS AC POWER SUPPLY OR INTERNAL BATTERIES SIGNAL COMMON In actual system environments, each signal and power return conductor can generate an interference voltage proportional to the net conductor resistance and the electrical current level. Any such interference voltages appear as common mode signals to the amplifier, and are rejected as such. 8 25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839 e-mail: [email protected] • Web Address: http://www.freqdev.com Model 900 Specifications (@25°C and rated Power Input) Battery Operation (Optional) Time for full Charge Battery Life Battery Charger Charge Status Indicator-Front Panel Battery Operation CMRR dB Vin = 20Vp-p 50 CMRR = 20 log Vout Vin FILTER A in 60 B in 70 Vout Vin > 60dB, dc to 50kHz 80 10K 1K dc to 600kHz 10M 1M Output Voltage Swing vs. Load Resistance 70 35 30 60 OUTPUT VOLTAGE SWING vs. LOAD RESISTANCE 25 50 RMS LOAD CURRENT 20 40 15 30 10 20 5 10 LOAD CURRENT mA 10V p-p for RL = 50Ω 20V p-p for RL = 2kΩ +/-100 mA continuous +/-200 mA without damage Short Circuit to Ground Only 50Ω Adjustable to Zero at Front Panel (Range +/-500mV dc) 100K FREQUENCY HZ 20 Watts max. 10 105 to 125Vac @ 50/60Hz 210 to 250Vac @ 50Hz 3/16 Amp 100 1K LOAD Ω 100k 10K Voltage Noise vs. Frequency 1x10 80 90 14 to 16 Hrs. @ 20 °C Approx. 500 Charge-Discharge Cycles Automatic Uninterruptible 3 Status Levels 9 hours typ. (See graph) AC LINE OPERATED 1x10 100 110 120 130 BATTERY OPERATION NO SHIELDING 1x10 fc Temperature Operating Temperature: With Batteries AC Line Storage Temperature 1x10 140 BATTERY OPERATION SHIELDED ENCLOSURE 100 10 +5 °C to +50 °C 0 °C to +50 °C -25 °C to +70 °C 1K FREQUENCY HZ 10K 100K Battery Life vs. Load Resistance 14 Weight with Battery without Battery Case Material Color 12 3.5"H x 8.5"W x 9.3"D 8.89cmH x 21.59cmW x 23.62cmD 4.5 lbs; 2.04 kgs. 3.5 lbs; 1.59 kgs ABS plastic PC Bone Vin = 1KHZ Sine - fc >>f in TA = 20 °C FILTER INPUT VOLTAGE 10 TIME (HRS) Mechanical Dimensions -4 8 1Vp-p 6 10Vp-p 4 NOTE: THE TIME SCALE IS PLOTTED FROM THE TIME WHEN THE POWER INDICATOR FLASHES. THE FILTER CAN BE OPERATED ABOUT ANOTHER 30 MIN. AT REDUCED SIGNAL. 20Vp-p 2 * Signal plus common mode voltage cannot exceed 20V peak for a linear output. ** Output characteristics of input amp with filter by-passed. 0 10 9 -5 HZ Power Supply AC Line Operation: Power Voltage Frequency Range-Rear Panel: 110 V 220 V Fuse 40 V/ Output Impedance Offset Voltage 20V p-p (Gain Set at 0 dB) Any Continuous Value between +/-100V Any Continuous Value between +/-100V 175pA max.; 30pA typ. 30 VOLTS p-p Short Circuit Output Current Output Protection 20 (0dBV = 1VRMS) Maximum Output Voltage 2 MΩ Shunted by 47pF 1 MΩ Shunted by 47pF HZ Output Characteristics Full Power Bandwidth** Common Mode Rejection Ratio vs. Frequency dBV/ Input Characteristics Input Impedance: Differential Single Ended Input Voltage: Linear Differential* Max Safe Differential Max Safe Common Mode Bias Current Common Mode Rejection Ratio with 2kΩ Source Unbalance and 0 dB Gain 100 1K LOAD Ω 10K 100k 25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839 e-mail: [email protected] • Web Address: http://www.freqdev.com -6 -7 Model 900 Pin-Out and Package Data Ordering Information Specification (25°C and Vs ± 15 Vdc) Model 900 INSTRUMENT ORDERING GUIDE A. CHASSIS 1. 900C 2. 900B 1 Standard AC powered chassis 1 AC powered, with battery powered option 2,4 FILTER TRANSFER FUNCTIONS AVAILABLE B. LOW-PASS BUTTERWORTH 1. 9L4B 2. 9L8B 4-pole Butterworth 8-pole Butterworth BESSEL 3. 9L4L 4. 9L8L 4-pole Bessel 8-pole Bessel ELLIPTIC 5. 9L8E 6. 9L8EY 8-pole elliptic, 1.77, 80dB 8-pole elliptic, 2.00, 100dB CONSTANT DELAY 7. 9L8D80 8. 9L8D10 8-pole constant delay, 80dB 8-pole constant delay, 100dB C. HIGH-PASS BUTTERWORTH 1. 9H4B 2. 9H8B ELLIPTIC 3. 9H8E 4. 9H8EY 4-pole Butterworth 8-pole Butterworth 8-pole elliptic, 1.77, 80dB 8-pole elliptic, 2.00, 100dB To order, simply specify the chassis style and filter model number that incorporates the desired features. Ordering Information Filter Type 3 L - Low-Pass H - High-Pass 900C/9L8L 1 Chassis Style C - Standard AC Power B - AC Powered, with Battery Power Option Transfer Function B - Butterworth L - Bessel D80 - constant delay (-80dB) D10 - constant delay (-100dB) E - elliptic 1.77 (-80dB) EY - elliptic 2.00 (-100dB) No. of Poles 4 8 NOTE: 1. See page 14, Item S - Voltage Select Switch: At time of shipment, voltage select switch is preset in the 110 Vac position. For 220 Vac operation, this switch must be rotated to the 220 Vac position. 2. Individual filter modules can be purchased for field replacement. 3. All models tunable from 0.1 Hz to 49.9 kHz. 4. See page 8 for Filter Replacement Instructions. We hope the information given here will be helpful. The information is based on data and our best knowledge, and we consider the information to be true and accurate. Please read all statements, recommendations or suggestions herein in conjunction with our conditions of sale which apply to all goods supplied by us. We assume no responsibility for the use of these statements, recommendations or suggestions, nor do we intend them as a recommendation for any use which would infringe any patent or copyright. IN-00900-00 10 25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839 e-mail: [email protected] • Web Address: http://www.freqdev.com